Varistors Raise The Heat Ceiling

TDK’s EPCOS metal oxide disk varistors are now approved for an increased operating temperature of +105°C, previously +85°C. The reason for this is the recertification of the B722 series varistors in accordance with UL 1449, 4th Edition, and IEC 61051. Raising the permissible operating temperature to +105°C also changes the climate category from 40/85/56 to 40/105/56. The flammability of the epoxy enclosure complies with UL 94 V-0. The monolithic varistors are available with rated voltages between 11 VRMS and 1.1 kVRMS and, depending on type, can withstand surge currents up to 20 kA (8/20 µs). To assist in the design process, PSpice libraries are available. Further information is available on the product webpage.


TDK Corporation of America

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